<template>
    <div class="component-upload-image">
        <el-upload
            ref="imageUpload"
            :action="uploadImgUrl"
            list-type="picture-card"
            :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload"
            :limit="limit"
            :multiple="multiple"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :on-remove="handleDelete"
            :show-file-list="true"
            :headers="headers"
            :file-list="fileList"
            :on-preview="handlePictureCardPreview"
            :class="{ hide: this.fileList.length >= this.limit }"
            :disabled="disabled"
        >
            <i class="el-icon-plus"></i>
        </el-upload>

        <!-- 上传提示 -->
        <div class="el-upload__tip" slot="tip" v-if="showTip">
            {{ $t('components.FileUpload.index.232435-1') }}
            <template v-if="fileSize">
                {{ $t('components.FileUpload.index.232435-2') }}
                <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                {{ $t('components.FileUpload.index.232435-3') }}
                <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
            </template>
            {{ $t('components.FileUpload.index.232435-4') }}
        </div>

        <el-dialog :visible.sync="dialogVisible" :title="$t('components.ImageUpload.384733-0')" width="800" append-to-body>
            <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
        </el-dialog>
    </div>
</template>

<script>
import { getToken } from '@/utils/auth';

export default {
    props: {
        value: [String, Object, Array],
        // 图片数量限制
        limit: {
            type: Number,
            default: 5,
        },
        // 大小限制(MB)
        fileSize: {
            type: Number,
            default: 5,
        },
        // 文件类型, 例如['png', 'jpg', 'jpeg']
        fileType: {
            type: Array,
            default: () => ['png', 'jpg', 'jpeg'],
        },
        // 是否显示提示
        isShowTip: {
            type: Boolean,
            default: true,
        },
        // 是否支持多选文件
        multiple: {
            type: Boolean,
            default: true,
        },
        // 是否禁止删除
        disabled: {
            type: Boolean,
            default: false,
        },
    },
    data() {
        return {
            number: 0,
            uploadList: [],
            dialogImageUrl: '',
            dialogVisible: false,
            hideUpload: false,
            baseUrl: process.env.VUE_APP_BASE_API,
            uploadImgUrl: process.env.VUE_APP_BASE_API + '/common/upload', // 上传的图片服务器地址
            headers: {
                Authorization: 'Bearer ' + getToken(),
            },
            fileList: [],
        };
    },
    watch: {
        value: {
            handler(val) {
                if (val) {
                    // 首先将值转为数组
                    const list = Array.isArray(val) ? val : this.value.split(',');
                    // 然后将数组转为对象数组
                    this.fileList = list.map((item) => {
                        if (typeof item === 'string') {
                            if (item.indexOf(this.baseUrl) === -1) {
                                item = { name: this.baseUrl + item, url: this.baseUrl + item };
                            } else {
                                item = { name: item, url: item };
                            }
                        }
                        return item;
                    });
                } else {
                    this.fileList = [];
                    return [];
                }
            },
            deep: true,
            immediate: true,
        },
    },
    computed: {
        // 是否显示提示
        showTip() {
            return this.isShowTip && (this.fileType || this.fileSize);
        },
    },
    methods: {
        // 上传前loading加载
        handleBeforeUpload(file) {
            let isImg = false;
            if (this.fileType.length) {
                let fileExtension = '';
                if (file.name.lastIndexOf('.') > -1) {
                    fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
                }
                isImg = this.fileType.some((type) => {
                    if (file.type.indexOf(type) > -1) return true;
                    if (fileExtension && fileExtension.indexOf(type) > -1) return true;
                    return false;
                });
            } else {
                isImg = file.type.indexOf('image') > -1;
            }

            if (!isImg) {
                this.$modal.msgError(this.$t('components.FileUpload.index.232435-6') + `${this.fileType.join('/')}` + this.$t('components.FileUpload.index.232435-7'));
                return false;
            }
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize;
                if (!isLt) {
                    this.$modal.msgError(this.$t('components.ImageUpload.384733-1') + `${this.fileSize} MB!`);
                    return false;
                }
            }
            this.$modal.loading(this.$t('components.ImageUpload.384733-2'));
            this.number++;
        },
        // 文件个数超出
        handleExceed() {
            this.$modal.msgError(this.$t('components.ImageUpload.384733-3') + `${this.limit}` + this.$t('components.ImageUpload.384733-4'));
        },
        // 上传成功回调
        handleUploadSuccess(res, file) {
            if (res.code === 200) {
                this.uploadList.push({ name: res.fileName, url: res.fileName });
                this.uploadedSuccessfully();
            } else {
                this.number--;
                this.$modal.closeLoading();
                this.$modal.msgError(res.msg);
                this.$refs.imageUpload.handleRemove(file);
                this.uploadedSuccessfully();
            }
        },
        // 删除图片
        handleDelete(file) {
            const findex = this.fileList.map((f) => f.name).indexOf(file.name);
            if (findex > -1) {
                this.fileList.splice(findex, 1);
                this.$emit('input', this.listToString(this.fileList));
            }
        },
        // 上传失败
        handleUploadError() {
            this.$modal.msgError(this.$t('components.ImageUpload.384733-5'));
            this.$modal.closeLoading();
        },
        // 上传结束处理
        uploadedSuccessfully() {
            if (this.number > 0 && this.uploadList.length === this.number) {
                this.fileList = this.fileList.concat(this.uploadList);
                this.uploadList = [];
                this.number = 0;
                this.$emit('input', this.listToString(this.fileList));
                this.$modal.closeLoading();
            }
        },
        // 预览
        handlePictureCardPreview(file) {
            this.dialogImageUrl = file.url;
            this.dialogVisible = true;
        },
        // 对象转成指定字符串分隔
        listToString(list, separator) {
            let strs = '';
            separator = separator || ',';
            for (let i in list) {
                if (list[i].url) {
                    strs += list[i].url.replace(this.baseUrl, '') + separator;
                }
            }
            return strs != '' ? strs.substr(0, strs.length - 1) : '';
        },
    },
};
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
    display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
    transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
    opacity: 0;
    transform: translateY(0);
}
</style>
